How to generate random numbers to satisfy a specific mean and median in python?

I would like to generate n random numbers e.g., n=200, where the range of possible values is between 2 and 40 with a mean of 12 and median is 6.5.

I searched everywhere and i could not find a solution for this. I tried the following script by it works for small numbers such as 20, for big numbers it takes ages and result is returned.

n=200
x = np.random.randint(0,1,size=n) # initalisation only
while True:
        if x.mean() == 12 and np.median(x) == 6.5:
            break
        else:
            x=np.random.randint(2,40,size=n)

Could anyone help me by improving this to get a quick result even when n=5000 or so?